1818.] Scientific Intelligence. 227 



effect of friction. They differ in the species of trees of which 

 they are the remains. In some there is a material difference in 

 the state of the cortex, although I could not learn that the pro- 

 cess of their formation is still going on. The greater part of the 

 specimens are cracked from the centre of the concentric circles ; 

 and the fissures are filled with quartz crystals. My friend Mr. 

 Bree, of Allesley (who has a large collection of these interesting 

 fossils) believes, that some few animal remains have been occa- 

 sionally found at this place in the same state. 



Believe me, dear Sir, yours very respectfully, 



T. J. Darwin. 



II. Meteorological Table kept at Derby. By J. D. Strutt, Esq. 



p2 



